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Pension Plans (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
AOCI Attributable to Parent, Before Tax [Roll Forward]    
Beginning Balance, value $ 874,589 $ 885,436
Ending Balance, value 1,201,998 874,589
Pension Plan [Member]    
AOCI Attributable to Parent, Before Tax [Roll Forward]    
Beginning Balance, value 27,027 24,738
Recognized during year - net actuarial (losses) (2,385) (2,288)
Occurring during year - settlement loss 30 (9)
Occurring during year - net actuarial losses (gains) 12,274 5,312
Foreign exchange impact (2,026) (726)
Ending Balance, value $ 34,920 $ 27,027